tstest/test/tapbundle/test.timing-edge-cases.ts

import { tap, expect } from '../../ts_tapbundle/index.js';

tap.test('ultra-fast test - should capture sub-millisecond timing', async () => {
  // This test does almost nothing, should complete in < 1ms
  const x = 1 + 1;
  expect(x).toEqual(2);
});

tap.test('test with exact 1ms delay', async (tools) => {
  const start = Date.now();
  await tools.delayFor(1);
  const elapsed = Date.now() - start;
  // Should be at least 1ms but could be more due to event loop
  expect(elapsed).toBeGreaterThanOrEqual(1);
});

tap.test('test with 10ms delay', async (tools) => {
  await tools.delayFor(10);
  expect(true).toBeTrue();
});

tap.test('test with 100ms delay', async (tools) => {
  await tools.delayFor(100);
  expect(true).toBeTrue();
});

tap.test('test with 250ms delay', async (tools) => {
  await tools.delayFor(250);
  expect(true).toBeTrue();
});

tap.test('test with 500ms delay', async (tools) => {
  await tools.delayFor(500);
  expect(true).toBeTrue();
});

tap.test('test with variable processing time', async (tools) => {
  // Simulate variable processing
  const iterations = 1000000;
  let sum = 0;
  for (let i = 0; i < iterations; i++) {
    sum += Math.sqrt(i);
  }
  expect(sum).toBeGreaterThan(0);
  
  // Add a small delay to ensure measurable time
  await tools.delayFor(5);
});

tap.test('test with multiple async operations', async () => {
  // Multiple promises in parallel
  const results = await Promise.all([
    new Promise(resolve => setTimeout(() => resolve(1), 10)),
    new Promise(resolve => setTimeout(() => resolve(2), 20)),
    new Promise(resolve => setTimeout(() => resolve(3), 30))
  ]);
  
  expect(results).toEqual([1, 2, 3]);
  // This should take at least 30ms (the longest delay)
});

tap.test('test with synchronous heavy computation', async () => {
  // Heavy synchronous computation
  const fibonacci = (n: number): number => {
    if (n <= 1) return n;
    return fibonacci(n - 1) + fibonacci(n - 2);
  };
  
  // Calculate fibonacci(30) - should take measurable time
  const result = fibonacci(30);
  expect(result).toEqual(832040);
});

// Test with retry to see if timing accumulates correctly
tap.retry(2).test('test with retry - fails first then passes', async (tools) => {
  // Get or initialize retry count
  const retryCount = tools.context.get('retryCount') || 0;
  tools.context.set('retryCount', retryCount + 1);
  
  await tools.delayFor(50);
  
  if (retryCount === 0) {
    throw new Error('First attempt fails');
  }
  
  expect(retryCount).toEqual(1);
});

// Test timeout handling
tap.timeout(100).test('test with timeout - should complete just in time', async (tools) => {
  await tools.delayFor(80); // Just under the timeout
  expect(true).toBeTrue();
});

// Skip test - should show 0ms
tap.skip.test('skipped test - should report 0ms', async (tools) => {
  await tools.delayFor(1000); // This won't execute
  expect(true).toBeTrue();
});

// Todo test - should show 0ms
tap.todo.test('todo test - should report 0ms', async (tools) => {
  await tools.delayFor(1000); // This won't execute
  expect(true).toBeTrue();
});

// Test with skip inside
tap.test('test that skips conditionally - should show time until skip', async (tools) => {
  await tools.delayFor(25);
  
  const shouldSkip = true;
  if (shouldSkip) {
    tools.skip('Skipping after 25ms');
  }
  
  // This won't execute
  await tools.delayFor(1000);
  expect(true).toBeTrue();
});

// Test with very precise timing
tap.test('test with precise timing measurements', async (tools) => {
  const measurements: number[] = [];
  
  for (let i = 0; i < 5; i++) {
    const start = process.hrtime.bigint();
    await tools.delayFor(10);
    const end = process.hrtime.bigint();
    const durationMs = Number(end - start) / 1_000_000;
    measurements.push(durationMs);
  }
  
  // All measurements should be at least 10ms
  measurements.forEach(m => {
    expect(m).toBeGreaterThanOrEqual(10);
  });
  
  // But not too much more (accounting for timer precision)
  measurements.forEach(m => {
    expect(m).toBeLessThan(20);
  });
});

// Test that intentionally has 0 actual work
tap.test('empty test - absolute minimum execution time', async () => {
  // Literally nothing
});

// Test with promise that resolves immediately
tap.test('test with immediate promise resolution', async () => {
  await Promise.resolve();
  expect(true).toBeTrue();
});

// Test with microtask queue
tap.test('test with microtask queue processing', async () => {
  let value = 0;
  
  await Promise.resolve().then(() => {
    value = 1;
    return Promise.resolve();
  }).then(() => {
    value = 2;
    return Promise.resolve();
  }).then(() => {
    value = 3;
  });
  
  expect(value).toEqual(3);
});

// Test to verify timing accumulation in describe blocks
tap.describe('timing in describe blocks', () => {
  let startTime: number;
  
  tap.beforeEach(async () => {
    startTime = Date.now();
    await new Promise(resolve => setTimeout(resolve, 5));
  });
  
  tap.afterEach(async () => {
    await new Promise(resolve => setTimeout(resolve, 5));
  });
  
  tap.test('first test in describe', async (tools) => {
    await tools.delayFor(10);
    const elapsed = Date.now() - startTime;
    expect(elapsed).toBeGreaterThanOrEqual(10);
  });
  
  tap.test('second test in describe', async (tools) => {
    await tools.delayFor(20);
    const elapsed = Date.now() - startTime;
    expect(elapsed).toBeGreaterThanOrEqual(20);
  });
});

// Parallel tests to see timing differences
tap.testParallel('parallel test 1 - 100ms', async (tools) => {
  await tools.delayFor(100);
  expect(true).toBeTrue();
});

tap.testParallel('parallel test 2 - 50ms', async (tools) => {
  await tools.delayFor(50);
  expect(true).toBeTrue();
});

tap.testParallel('parallel test 3 - 150ms', async (tools) => {
  await tools.delayFor(150);
  expect(true).toBeTrue();
});

tap.start();